EP0809334A2 - Schleifringanordnung - Google Patents

Schleifringanordnung Download PDF

Info

Publication number
EP0809334A2
EP0809334A2 EP97201526A EP97201526A EP0809334A2 EP 0809334 A2 EP0809334 A2 EP 0809334A2 EP 97201526 A EP97201526 A EP 97201526A EP 97201526 A EP97201526 A EP 97201526A EP 0809334 A2 EP0809334 A2 EP 0809334A2
Authority
EP
European Patent Office
Prior art keywords
slip ring
ring assembly
assembly according
slip
rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97201526A
Other languages
English (en)
French (fr)
Other versions
EP0809334A3 (de
Inventor
Jan Johannes Van Den Akker
Maria Margaretha Henrietta Frongink
Jan Nijhuis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Precisie Industrie Vd Akker Bv
Original Assignee
Precisie Industrie Vd Akker Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Precisie Industrie Vd Akker Bv filed Critical Precisie Industrie Vd Akker Bv
Publication of EP0809334A2 publication Critical patent/EP0809334A2/de
Publication of EP0809334A3 publication Critical patent/EP0809334A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings

Definitions

  • the present invention relates to a slip ring assembly, comprising at least one rotor made of an insulating material, with an at least substantially radial symmetry around a rotation axis, on the outer periphery of which a number of metal slip rings are coaxially placed around the rotation axis, and at least one stator, provided with a number of current collectors each of which makes contact in the operating condition with one slip ring.
  • Slip ring assemblies of this type are known from, for instance, US-A-5,224,138 and are frequently employed in engineering, particularly in an arrangement where, for the benefit of a rotating part of the arrangement, signals or supply voltages must be fed in or out.
  • a drawback of known slip ring assemblies is formed by the limited breakdown voltage between the adjacent slip rings.
  • the breakdown voltage is further adversely affected by metal grit as a result of wear of the current collectors and of the slip rings, the metal grit being liable to be deposited on the insulating material.
  • moisture may often penetrate into the slip ring assembly, likewise adversely affecting the breakdown voltage.
  • the slip ring assembly according to the invention eliminates this drawback to a significant extent, among other things by enlarging the creepage path without significantly increasing the dimensions, and is characterised in that he rotor is provided with a number of radially extending grooves and that each slip ring is embedded completely countersunk in one of the grooves.
  • the grooves are chosen so as to be at least substantially V-shaped in cross-section, which has been found to effect an increase of the breakdown voltage. Surprisingly, it is advantageous in this case to extend the V-shaped grooves into the slip rings.
  • An advantageous choice in this context is an embodiment where the V-shaped groove extends for 20%-40% of its total depth into the slip ring.
  • the grooves may in this case have a flat or a rounded bottom, which has the advantage that the thickness of the slip rings can be designed relatively thin.
  • each V-shaped groove there is necessarily a radially extending transition from the insulating material to the metal of the slip ring.
  • this transition plays an important part in the initiation of a breakdown between adjacent slip rings.
  • Another advantageous embodiment of the slip ring assembly according to the invention reduces this risk of a breakdown and is characterised in that the transition plane from insulating material to metal is at least substantially perpendicular to the surface of the groove.
  • the top angle of the V-shaped groove may be varied whereby the transition plane and the surface of the groove are kept mutually perpendicular, by providing the slip ring in a radial sense with a suitable tapering.
  • Yet another embodiment of the slip ring assembly featuring a favourable breakdown voltage is then characterised in that the top angle of the V-shaped groove is 60-90 degrees.
  • a problem with slip rings that is also well-known in the art concerns the wear caused by friction between the slip rings and the current collectors.
  • Yet another embodiment of the slip ring assembly according to the invention is characterised in that the V-shaped groove is gold-plated for as far as it extends into the slip ring.
  • the current collectors preferably comprise a number of gold-plated rods, made of an elastic metal and fitted together on one end in a bundle. Owing to the favourable V-shape of the groove and its flat or rounded bottom the current collector is automatically centred.
  • the bundle is automatically held together and lies stable in the groove, which is conducive to a reliable and low-noise contact transition between the slip ring and the current collector. It was found incidentally that bundles of three or seven rods showed very favourable results because they rest particularly stable in the grooves.
  • Fig. 1 shows in cross-section a possible embodiment of a slip ring assembly according to the invention, where a tubular rotor 1, which can rotate around a rotation axis 2 and which is made of an insulating material, for instance epoxy resin, is provided with slip rings 3 which have been fitted countersunk in the insulating material and which are accessible via radially extending grooves 4 formed in the outer periphery of the tubular rotor 1. Also shown is a current collector 5, in this case comprising three elastic metal rods which rest at least substantially tangentially against the associated slip ring, thus providing a connection between the usually rotating slip ring and the non-rotating environment.
  • a current collector 5 in this case comprising three elastic metal rods which rest at least substantially tangentially against the associated slip ring, thus providing a connection between the usually rotating slip ring and the non-rotating environment.
  • slip rings can be located in axial sense closely adjacent to one another, while nevertheless the creepage path between neighbouring slip rings, and consequently the breakdown voltage between the slip rings, is large. It is further indicated how a connection can be made to a slip ring 3, by providing slip ring 3 with a metal rod 6 which extends into the hollow ring. Of course rod 6 may also take the form of a filament. It is also possible to establish a connection afterwards, by drilling through the ring at the spot where rod 6 is to be positioned, fitting the bore with an internal thread, and screwing home in it a rod 6 provided with an external thread, such that it makes contact with slip ring 3.
  • Fig. 2 shows in cross-section an advantageous embodiment of a slip ring assembly according to the invention, where the radially extending grooves have been chosen to be V-shaped in cross-section.
  • the further advantage of grooves formed in this manner is that, when the stator is mounted, the current collectors are automatically guided by them to the slip rings 3, hardly ever getting caught behind the raised edges between the grooves.
  • Fig. 3 shows in cross-section a very advantageous embodiment of the slip ring assembly according to the invention, with the V-shaped groove 4 extending into slip ring 3.
  • the current collectors rest confined in a V-shaped groove during operation, which contributes to a sound, stable contact transition.
  • the V-shaped groove preferably has a flat bottom, securing for current collectors 5 an especially stable position.
  • This embodiment has moreover been found to achieve a still more favourable breakdown voltage, especially if the transitions 7 from insulating material to metal are at least substantially perpendicular to the groove surfaces.
  • slip rings as well as the current collectors, to be gold-plated, at least in those places where the actual contact is made. This results in a low contact resistance, little wear and a minimum of noise added by the slip ring assembly to the signals it is required to transport.
  • the slip ring assembly according the invention is very suitable as a building element for the assembly of a more complicated assembly.
  • rotor 1 is provided with a raised collar 9 on one end and on the other end with a recess 10 that is complementary to the former, or with comparable centring means. Any assembly can then be assembled using this type of building elements.
  • Even more universal assembly is possible using, for instance, two types of slip ring assemblies, a first type having, for instance, 6 high-power rings, such as shown in Fig. 1-3, and a second type with 12 more finely machined low-power rings.
  • Fig. 4 shows how a slip ring assembly according to Fig. 3 can be realised advantageously.
  • the slip rings 3 in this case are introduced into a casting mould, the clearance and the centring of the slip rings being obtained with the aid of the edges 11.
  • Next rotor 1 is cast from epoxy resin, preferably in a vacuum centrifugal casting process that is well-known in the art. Subsequently the rotor is provided, for instance on a lathe, with the V-shaped grooves. Finally the slip rings are electro-gold-plated, with the connections 6 available for hook-up to, for instance, a current source.
  • Fig. 5 shows in cross-section and in side-view a current collector with three rods 12 which are on one end conductively fitted, for instance soldered, in a metal cylinder 13.
  • the current collector is suitable for working in conjunction with a slip ring having a width of 0.65-0.85 mm; the rods have a thickness of 0.15-0.45 mm and are gold-plated. They are made of an elastic material, such that the current collector can be pressed tangentially against a slip ring with a pressure of 1-5 grams without bending more than some ten degrees. Mounted in this manner the current collector is able to transmit 5 amperes over a prolonged period of time. Larger current strengths are possible by fitting several current collectors connected in parallel and distributed over the periphery of the slip ring.
  • Fig. 6 shows in cross-section and in side-view a current collector comprising seven rods 12, which is built up in a comparable fashion and which can handle the sustained transmission of 15 amperes.
  • the current collector is suitable for working in conjunction with a slip ring having a width of 1.3-1.7 mm; the rods have a thickness of 0.15-0.45 mm.
  • the current collectors can be set into blocks of an insulating material, always allowing a number of current collectors to be built together according to Fig. 5 or Fig. 6, such that they can cooperate with the modularly built up slip ring segments.
  • a complex slip ring assembly can be assembled from slip ring segments and with current collector segments.
  • Fig. 7. shows in cross-section a slip ring assembly of the pancake type according to the invention, as applied if in an axial sense there is little space but in a radial sense there is ample space.
  • rotor 1 which is made of insulating material, can rotate around rotation axis 2, but now it has the form of a flat disk, the slip rings 3 being fitted countersunk in the insulating material and accessible via V-shaped grooves 4.
  • the grooves and the slip rings are shown only on the upper surface of rotor 1, but it is quite possible to equip the bottom surface with them, too.
  • Fig. 8 shows a current collector embodying three rods for application in combination with the pancake. To achieve a well-defined contact the current collector is provided with a curved profile, the curved profile being placed in the groove. Apart from the curved profile the current collector is identical to the current collector described with reference to by Fig. 5.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
EP97201526A 1996-05-23 1997-05-22 Schleifringanordnung Withdrawn EP0809334A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1003192 1996-05-23
NL1003192A NL1003192C1 (nl) 1996-05-23 1996-05-23 Sleepringenwals.

Publications (2)

Publication Number Publication Date
EP0809334A2 true EP0809334A2 (de) 1997-11-26
EP0809334A3 EP0809334A3 (de) 1998-11-18

Family

ID=19762919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201526A Withdrawn EP0809334A3 (de) 1996-05-23 1997-05-22 Schleifringanordnung

Country Status (2)

Country Link
EP (1) EP0809334A3 (de)
NL (1) NL1003192C1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008042183A3 (en) * 2006-10-02 2008-06-19 Tyco Electronics Corp Rotary joint

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE314724C (de) *
US1339988A (en) * 1917-03-20 1920-05-11 Steinberger Louis Insulating collector or distributer spool
FR2691587A1 (fr) * 1992-05-25 1993-11-26 Valeo Commutation Contacteur tournant, notamment pour véhicule automobile.
GB2270568A (en) * 1992-09-15 1994-03-16 Crane Electronics Torque transducer having a slipring and brush assembly
FR2715005B1 (fr) * 1994-01-10 1996-03-22 Air Precision Sa Collecteur électrique tournant à balais multibrins.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008042183A3 (en) * 2006-10-02 2008-06-19 Tyco Electronics Corp Rotary joint
US7481655B2 (en) 2006-10-02 2009-01-27 Tyco Electronics Corporation Rotary joint

Also Published As

Publication number Publication date
NL1003192C1 (nl) 1997-11-25
EP0809334A3 (de) 1998-11-18

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